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🌊 Marine Data Deficient 🍽️ Edible ⚠️ Venomous ⚡ Venomous 🌡️ Tropical

Blotched foxface

Siganus unimaculatus Evermann & Seale, 1907
Max Length
20 cm
Max Weight
-
Lifespan
-
Trophic Level
2.7
Depth
-
Climate
Tropical
Resilience
High
Vulnerability
17.00/100
Typical Length
-
Depth Zone
reef

📖 Overview

Inhabits rich coral areas of lagoons and outer reefs, often among staghorn corals . Small juveniles occur in schools of up to a few hundred fish, larger juveniles and adults occur in pairs. Feeds on seaweeds .

Scientific Name
Siganus unimaculatus
Authority
Evermann & Seale, 1907
Habitat
Marine
Climate
Tropical
Body Shape
Short and / or deep
IUCN Status
DD
Max Length
20 cm
Latitude
30°S – 30°N
Trophic Level
2.7
Resilience
High
Vulnerability
17.00/100
Salinity
30–40 ppt

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 13; Dorsal soft rays (total): 10; Anal spines: 7; Anal soft rays: 9; Vertebrae: 13. Color the same as in S. vulpinus except for the blackish spot posteriorly on the upper side of the body. Caudal peduncle only slightly incised. Spines stout, pungent, and venomous. Preopercular angle 109°-119°. Variable cheek squamation; usually covered with scales, 7-10 rows deep below center of orbit, occasionally a few scattered scales present below eye; a triangular area from lower edge of orbit to angle of mouth always fully scaled. Fully scaled midline of thorax.: short and / or deep; Cross section: compressed.

🌀 Behaviour

Behavioural data for Blotched foxface is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous 📦 Batch Spawner
Spawning Season
spring-summer
Spawn Location
Pelagic
Fertilization
External

🌍 Habitat & Distribution

Marine; reef-associated; depth range ? - 30 m , usually 1 - 30 m . Tropical; 30°N - 30°S North West Shelf, Western Australia.

🌿 Ecology

Zone Preferences
🌊 Marine 🪸 Reef Associated
Trophic Level
2.7±0.3
🐠 Schooling
Food Items

seaweeds (Ref

📐 Morphometrics

Length–Weight Relationship: W = 0.01413 × L3.05 (TL)
Max TL
20cm
Dorsal Spines
13
Dorsal Rays
10
Anal Spines
7
Anal Rays
9
Vertebrae
13

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Data Deficient
Assessment Date
2018

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
17.00/100
Low vulnerability
Trophic Level
2.7
Omnivore / Planktivore
Body Shape
Short and / or deep
Climate Zone
Tropical
Latitude Range
30°N – 30°S
Described By
Evermann & Seale, 1907

⚠️ Venom Profile

Medical Warning: This species is venomous. Seek immediate medical attention if envenomated. Contact emergency services and follow first aid guidance below.
Venom Type
proteinaceous neurotoxin
Delivery
dorsal, anal, and pelvic fin spines
Potency
Severe
Mortality Risk
Low
Symptom Onset
5min
Duration
24.0hrs
Antivenom
✗ Not Available
Named Toxins
high-molecular-weight protein (Stonustoxin analogue) acetylcholine
Symptoms
  • immediate intense pain
  • swelling
  • erythema
  • occasional nausea and weakness
Affected Body Systems
peripheral nervous system cardiovascular
First Aid
Immerse affected area in hot water (45 C, tolerable) for 30-90 minutes to denature toxin. Do not apply ice.
Medical Treatment

Analgesia; wound care; tetanus prophylaxis; severe cases may require monitoring for systemic effects.

References: Compiled from Bhide (2018), Halstead et al. (1988) and family-specific envenomation literature

🍽️ Edibility & Flavour

"Blotched foxface is an edible species."

✗ Not for Raw
✓ Fresh Indicators
  • Clear, bright eyes — cloudy eyes indicate age
  • Firm flesh that springs back when pressed
  • Fresh ocean smell, never strong or ammonia-like
  • Bright red or pink gills, not grey or brown
  • Shiny, moist skin with scales tightly attached
✗ Avoid If
  • Cloudy or sunken eyes
  • Strong fishy or ammonia odour
  • Soft, mushy flesh that doesn't spring back
  • Discoloured or dry flesh
Best Cooking Methods
Baking Grilling Pan-frying

⚡ Nutrition

Per 100g cooked - Source: USDA FoodData Central

Nutrient Amount
Protein 18.7 g
Omega-3 (total) 119 mg

🔬 Mercury Safety

Mercury data for Blotched foxface has not yet been assigned. Please consult FDA/EPA guidance for general seafood safety advice.

🌿 Sustainability

Best Choice
Healthy stocks, low impact
Good Alternative
Well-managed, minor concerns
Use Caution
Check sourcing and season
Avoid
Overfished or high impact

🔬 Full Nutritional Profile

Per 100g - Raw, per 100g - Source: USDA FoodData Central templates (generic fish average)

Proximate Composition
Energy125 kcal
Moisture75 %
Protein20 %
Total Fat4 %
Ash1.3 %
Fatty Acids (g)
Saturated Fat1 g
Monounsaturated Fat1.2 g
Polyunsaturated Fat1.5 g
Omega-3 Total1 g
EPA0.3 g
DHA0.5 g
Omega-6 Total0.3 g
Key Minerals & Vitamins
Calcium20 mg
Iron0.7 mg
Magnesium30 mg
Phosphorus220 mg
Potassium380 mg
Sodium55 mg
Zinc0.5 mg
Selenium32 µg
Vitamin B122 µg

📊 Population Dynamics

Year Region Index Notes
- - -

🌐 Names & Taxonomy

Scientific Synonyms

Scientific Name Author Year Status
Lo unimaculatus Evermann & Seale 1907 Synonym

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 3 records indexed .

Occurrence density from GBIF View GBIF records ↗

👥 Community & Contribute

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